Latch.



PATENTED SEPT. 1, 1908. E. KRAFFT.

LATCH.

APPLICATION FILED MAR. 2, 1908.

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11.897749, I PATENTED SEPTfl 1908.

0 E. KRAPPT.

LATCH.

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UNITED STATES PATENT FFTQE.

EMIL KRAFFT, OF NEW YORK, N. Y.

LATCH.

T all whom it may concern:

Be it known that I EMIL KRAFFT, a citizen of the United States, and a resident of the city of New York, borough of Manhattan, in the county and State of New York, have invented a new and Improved Latch, of which the following is a full, clear, and exact description.

This invention is an improvement in latches more especially designed for the doors of toilet rooms and places generally where privacy is desired, and has in view such a device in connection with the spindle of the door knob which will operate the latter in a manner to indicate whether or not the room is occupied; this operation, however, being entirely under the control of the party on the inside.

The invention may be applied directly to the door independent of the usual lock, or be made as a part of such lock; in the latter case the latch spindle having the door knobs performs its usual functions as well as those incident to my improvements.

Reference is to be had to the accompanying drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a fragmentary view of a door and the adjacent casing with one embodiment of my invention applied thereto; Fig. 2 is a plan of the construction shown in Fig. 1, partly in section, and showing the parts in the extreme positions of their movement in full lines and dotted lines, respectively; Fig.

3 is a fragmentary sectional view of a lock with which the latch shown in Figs. 1 and 2 may be used if desired; Fig. 4 is a complete face view of such a lock with the faceplate removed and showing the latch spindle in section and in normal inoperative position and Fig. 5 is a plan of my invention in connection with a lock, partly in horizontal sec tion.

Referring more especially to Figs. 1 and 2, wherein is shown a door 1.0 and theadjacent casing 11 to which one embodiment of my improvements is applied, the same includes a latch bolt 12 slidably mounted in guides 13 on a plate 14 which is attached to the door, and a plate 14 attached to the door casing having a keeper 13 in which the bolt 12 passes when projected. The bolt 12 has an operating knob 15 intermediate its length,

\ and at its inner end is provided with a forwardly directed hook 16; the construction Specification of Letters Patent. Application filed. March 2, 1908. Serial No. 418,714.

Patented Sept. 1, 1908.

of this part of my invention, with the eXcep tion of the hook on the bolt, it will be observed, being substantially the same as latches which are in general use.

Slidable longitudinally and transversely in a lateral slot through the door is a spindle 17 having a knob 18 secured to its outer end, the said knob being preferably constructed with a flat inner face which permits of its closely contacting with the door when the spindle is drawn inwardly. To the opposite and inner end of the spindle, at the inside of the room, is secured the outer plate of two hinged plates 19, the inner plate of which is pivoted or hinged to the base-plate 14 of the latch. The inner plate .of the hinged plates is also connected with the latch bolt 12 by a link or loop which preferably has its free ends pivotally mounted in cars or projections on the outer face of the link, and engages under the hook 16.

In the operation of this form of my improved latch, when the party at the inside of the room fully projects the latch bolt the door knob 18 at the outside is carried from the dotted position shown in Fig. 2 flat against the door, as shown in full lines, by reason of the longitudinal and lateral pull exerted on the spindle given by the bolt through the intermediary of the link and hinged plates. This position of the knob at the outside of the door indicates to any one at the outside of the room that the latch is projected and that the room is presumably occupied. The knob in this position also presents no substantial means by which the spindle might be drawn outwardly. 1f,how ever, this be accomplished the latch bolt will not be fully withdrawn from the keeper 13*, as it is necessary to slide this bolt some dis tance over the inner plate of the hinged plates, as shown in Fig. 1, before the door may be. opened. This makes it necessary to prolong the hook, as shown, in order that the link 20 will not be disengaged. This construction further makes it possible for the party at the inside of the room to secure the door by the latch bolt without drawing the knob inwardly, thus making it appear that the room is unoccupied. If the latch bolt be fully projected, as shown in full lines in Fig. 2, and then be withdrawn to the position shown in Fig. 1, the rear end of said bolt striking the inclined face presented by the inner plate of the hinged plates depresses the same and forces the door knob outwardly.

a is in any position in the slot of the door.

That form of my invention illustrated in Figs. 3 to 5 inclusive, is in all respects the same as that just described except that in stead of applying the latch bolt directly to the door it is secured to the usual lock. The lock is, however, modified to admit of the latch spindle operating the latch bolt 21 in the usual manner when the said spindle To this end I provide the face-plates of the lock with slots equal in extent to the slot in the door, and slidably support therein a shoe 22, through which the spindle 17 slides. The shoe 22 bears on the flange of a guide-plate 23 which is normally forced upwardly by a sprin 24:, and is connected. with the latch spindle of the look through the intermediary of a bell-crank lever 25. By this construction it is seen that when the latch spindle slides transversely, the shoe moves over the top of the guide-plate, and operates to depress said plate when the spindle is revolved I'in any position of the spindles longitudinal and transverse movements. It is thus seen that the operation of .the latch bolt of the lock by the latch spindle does not interfere with the operation of this spindle and the attached outer knob by the auxiliary orlatch bolt 12, but that an additional securing means by the use of the lock is afiorded.

It is apparent that other modifications of my improvements other than those herein described will suggest themselves to those familiar to the art to which the invention appertains, and I accordingly consider that I am entitled to such modifications as fall within the scope of the annexed claims.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

1. The combination of a sliding latch bolt, a door knob having a spindle longitudinally and laterally movable, members pivoted together, one of which is pivotally sup orted and the other connected to the spind e, and a link connecting the pivoted member to the latch bolt.

2. The combination of a sliding latch bolt having a hook at its innerend, a door knob having a spindle longitudinally and laterally movable, members pivoted together, one of which is pivotally supported and the other connected to the spindle, and a device pivotally supported at an intermediate polnt of the pivoted member and engaging over the hook of the latch bolt.

3. In combination with a door, a knob having as indle movable longitudinally and transverse y through the door, and a latch bolt for locking the door, operatively connected with the spindle and adapted to draw the knob inwardly when the bolt is projected.

4. In combination with a door, a latch bolt therefor at one side of the door, a door knob at the opposite side of the door, and

means for moving the knob to and from the door by the operation of the bolt.

' 5. In combination with a door, a latchbolt for locking the door at one side thereof, a knob at the opposite side of the door, members pivoted together, one of which is pivotally supported on the door adjacent to the bolt, and the other fixed relatively to the knob, and means connecting the pivotallysupported member with the bolt.

6. In combination with a door, a knob having a spindle passing through the door, and a latch-bolt for locking the door, operatively connected with the spindle to move the knob toward the door when projected, and having a limited movement independent of the knob when passing from a fully projected to a partially retracted position.

7. The combination of a knob having a spindle, members pivoted together, one of which is pivotally supported, and the other connected to the spindle, and a latch-bolt slidable over the pivoted member and having a connection therewith.

8. In combination with a door and door casing, a knob having a. spindle slidable through the door, a keeper secured to the casing, a latch bolt carried by the door, and means connecting the bolt with the spindle for drawing the knob toward the door when the bolt is fully projected into the keeper, said means permitting of the knob being moved from the door while the latch bolt is engaged in the keeper.

9. In combination with a door, a knob having a spindle slidable through the door, and means for locking the door, operatively connected with the spindle and adapted to move the knob to and from the door.

10. A'lock having a revoluble latch spindle slidable longitudinally and transversely therein, and a latch bolt operatively connected to the spindle.

11. In combination with a lock having a latch bolt, a latch spindle for operating the latch bolt, an auxiliary latch bolt, and means operatively connecting the auxiliary latch bolt with the latch spindle to move said s indle longitudinally by the operation of the auxiliary latch bolt.

12. A look having a revoluble latch spindle slidable longitudinally and transversely, in combination with a latch bolt operatively connected with the spindle for sliding it in the lock by the operation of the bolt.

13. In combination with a door, a latch bolt at one side thereof, a device at the opposite side thereof, and means operatively connecting the said device with the bolt for moving the device to and from the door by the operation of the bolt.

14. A look having a latch bolt, a revoluble latch spindle for operating the latch bolt, slidable transversely in the lock, and an auxiliary latch bolt operatively connected with the spindle to move it longitudinally when In testimony whereof I have signed my the auxiliary bolt is operated. name to this specification in the presence of 15. In combination with a lock having a two subscribing witnesses. latching spindle laterally slidable therein, and EMIL KRAFFT. 5 a latch-bolt carried by the lock, operatively Witnesses:

connected with the spindle to move it by the W. W. HOLT, operation of the bolt. JOHN P. DAVIS. 

